Fix groupedmessage indexing error (#2777)

* fix groupedmessage indexing error

install/set-up-and-migrate-database.sh

@@ -1,5 +1,13 @@
 echo "${_group}Setting up / migrating database ..."
 
+# Fixes https://github.com/getsentry/self-hosted/issues/2758, where a migration fails due to indexing issue
+$dc up -d postgres
+timeout 90s bash -c "until $dc exec postgres pg_isready ; do sleep 5 ; done"
+indexes=$($dc exec postgres psql -qAt -U postgres -c "SELECT indexname, indexdef FROM pg_indexes WHERE tablename = 'sentry_groupedmessage';")
+if [[ $indexes == *"sentry_groupedmessage_project_id_id_515aaa7e_uniq"* ]]; then
+ $dc postgres psql -qAt -U postgres -c "DROP INDEX sentry_groupedmessage_project_id_id_515aaa7e_uniq;"
+fi
+
 if [[ -n "${CI:-}" || "${SKIP_USER_CREATION:-0}" == 1 ]]; then
  $dcr web upgrade --noinput
  echo ""